Concrete flue-vent.



.l. D. BRUNNER CONCRETE FLUE VENT.

APPLICATION FILED JUNE 20. I918.

Patented Mar. 18, 1919.

. /NVENTR g JAVD.BRUNNEI? JAY D. BRUNNER, F 110$ ANGELES, CALIFORNIA.

CONCRETE FLUE-VENT.

* Specification of Letters Patent. Pat'gnted Dial. 18, 1919 Application filed June 20, 1918. Serial No. 241,034.

To all whom it may concern:

Be it known that I, JAY D. BRUNNER, a citizen of the United States, residing at Los Angeles, in the county of'Los Angeles and State of California, have invented new and useful Improvements in Concrete Flueadapted to Vents, of which the following is a specification.

My invention relates to concrete flue vents and consists in the novel features herein shown, described and claimed.

' Primarily my object is to make a concrete sectional flue vent for use with all kinds of gas burning appliances and tomake the sections so that they may be easily matched together and bonded to make the pipe impervious to the gases escaping from the gas flame. 1

Figure 1 is a side elevation of-a piece of fine vent embodying the principles of my invention, parts beingbroken away and shown in section. v

Fig. 2 is an enlarged lower end perspective of one of the concrete sections and showing the joint construction.

Fig. 3 is a fragmentary perspective of the upper end of a concrete section and showing the joint construction which mates with the construction shown in Fig. 2.

Fig. 4 is an enlarged fragmentary sectional detail on the line H of Fig. 1.

In constructing a flue vent in accordance with the principles of my invention, concrete pipe sectlons 1, 2 and 3 are matched and bonded together end to end to producethe desired length of pipe and the desired shape. As shown, the sections 2 and 3 are forty-five degree elbows. Ihe concrete pipe sections are made of-a good grade of concrete and are preferably rectangular in crosssection. Each section, whether straight or an elbow, is formed with a lower end 4:

fit upon the upper end 5 of an adjoining section. .In other words, each section has a lower end, 4 and an upper end 5, the lower end of one section fitting the upper end of the section below.

The outer upper end face 6 of the section 1 extends from the outer side face 7 about one-third of the way to the inner side face 8, and the inner end face 9 extends from the inner side face 8 about one-third of the way to the outer side face 7, and the inclined face 10 connects the outer side of the inner end face 9. to the inner side of the outer end face 6 at an angle of about thirty degrees relative to the side faces, the area of the lncllned face 10 being substantially equal to the combined areas of the end faces 6 and 9.

The lower outer end face 11 of the section 2 fits the upper outer end face 6 of the section 1, the lower inner end face 12 of the section 2 fits the inner upper end face 9 of the section 1, and the bevel face 18 of the section 2 fits the bevel face 10 of the section 1.

In setting up the pipe sections a suficient coating of heavy cement is applied to the faces (5, 9 and 10 of the section 1 and the section 2 is pressed downwardly firmly into place, the bevel faces 10 and 13 serving to line the sections to bring their outer faces into position to make a smooth pipe and said bevel faces lnaking'a tapered joint connection which will tighten up as the section 2 is pressed into place more or less as desired, thereby taking the pressure off of the cement between the faces 12 and 9 and the faces 6 and 11.

By reference to Fig. 4 it will be seen that the faces 10 and 13 come together before the faces 6 and 11, and 9 and 12 come together. The cement 14: between the faces 10 and 13 will fit the unevenness of the faces and if the sections are pressed tightly together this cement will be pinched out at the points of contact and at the time that thesections are set the faces 6 and 11, and 9 and 12 will be spaced apart and a considerable body 15 of the cement will remain between. the faces 9 and 12 and a similar body 16 will remain between the faces 6 and 11 and then when the cement has bonded and hardened the flue vent will be as solid and impervious as though it were all cast integral.

Heretofore it has been usual to use halflap joints but in this half-lap square cornered construction it-is impossible to get the bokdies 15 and 16 of cement in the finished o The products of. combustion have no effect upon the structure of my flue vent and cannot escape through the wall of the flue vent.

Thus I have produced a concrete flue vent formed of concrete pipe sections, each section having a. female end and a male end, the female end of'one section fitting the male end of another section, a female end and a male end forming a half-lap joint the intermediate faces of which are tapered and the outer and inner faces o-f which are flat, the tapered faces being adapted to tighten upon each other before the flat faces come togcther, so as to line up the sections and leave spaces between the flat faces for cement, and cement in the spaces.

I claim: I

A section of concrete flue vent comprising two concrete pipes mounted end to end; the meetin end of one pipe havin an end face extending at right angles to the outer side face and about one-third of the way across, a second end face extending at right angles to the inner side face about one third of the Way across, and a third end face connecting the inner ends of the first and second end faces at an angle of about 30 the meeting end of the other pipe having an end face extending at right angles to the outer side face and about one-third of the Way across, a second endface extending at right angles to the inner side face about one-third of the Way across, and a third end face connecting the inner ends of the first and second end faces atan angle of about 30; one meeting end, be-

ing male and the other meeting end being female; the inclined face of one meeting end fitting and tightening up upon the inclined face of the other meeting end to make a half-lap; and the parts being proportioned, so that the inclined faces Will come tight together and hold the flat faces from coming together.

In testimony whereof I have signed my name to this specification. 1 JAY D. BRUNNER. 

